Heat Transfer
Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by

Keeping the heat transfer surface clean
Enhancing the fluid pumping rate
None of these
Increasing the tube length

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Heat Transfer
Leidenfrost point is a term concerned with the

Condensation of the saturated vapor on a cold surface
Concentration of a corrosive solution by evaporation
Heat transfer between two highly viscous liquids
Boiling of a liquid on a hot surface

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